biodegradable modular nest made of eggshells attracts butterflies to city centers

EggNest: a modular shelter for butterflies in urban settings

EggNest is a sculptural, modular structure developed by Jayoung Kim, Jungmin Park, and Chaewon Lee as a shelter for butterflies in urban settings. Constructed from eggshells and soil, it offers a microhabitat that facilitates pollinator activity and supports vegetation such as moss and flowers. The project addresses the need for biodiversity integration within cities.

As urban environments present challenges for maintaining biodiversity, EggNest proposes a shared ecological space where both human and non-human species can coexist. Rather than designing exclusively for one group, the structure balances environmental and functional needs, creating a compatible setting for butterflies and urban dwellers alike. The system is composed of adaptable modules that respond to varying urban contexts. The modular design is informed by expert input, particularly regarding the thermal and humidity conditions needed for butterfly survival. Gaps between modules allow for the growth of moss and flowering plants, supporting humidity retention while visually functioning as urban planters.

all images courtesy of Jayoung Kim, Jungmin Park, and Chaewon Lee

eggshells and soil construct EggNest’s sculptural form

EggNest, developed by designers Jayoung Kim, Jungmin Park, and Chaewon Lee, is formed from a composite of crushed eggshells and soil, selected for their biodegradability and surface texture. The rough material aids in butterfly landing and clinging, while also promoting the growth of small plants. The structure naturally decomposes over time, returning nutrients to the environment. Its curved form supports thermal regulation, increases insulation, and provides partial protection from predators.

The shelter’s geometry and material strategy are intended to support long-term pollinator activity in the urban fabric. EggNest functions as both habitat and environmental infrastructure, encouraging ecological interaction while blending into the urban landscape. Its design supports stable temperatures, moisture control, and protective conditions for butterflies, contributing to urban biodiversity and cyclical ecological processes.

EggNest provides a modular shelter for butterflies in urban environments

constructed from eggshells and soil, the structure supports natural decomposition

the form regulates temperature and retains moisture for butterfly survival

creating sturdiness by grinding various biodegradable materials such as eggshells and agar powder

gaps between modules foster the growth of moss and flowering plants

the mixture is shaped with a 3D-printed mold

butterflies resting in EggNest spread pollen as they leave, supporting nature’s cycle

EggNest is modular, allowing it to be stacked in various ways based on terrain

project info:

name: Eggnest
designers: Jayoung Kim, Jungmin Park, Chaewon Lee

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edited by: christina vergopoulou | designboom