Grimm's Building Set Arcs in Squares

The set contains 81 wooden blocks arranged in a wooden frame, and almost every piece features a large or small arc in some form. The blocks pack back into the frame for storage, and the mix of arched and square shapes gives builders a versatile palette for both flat mandala designs and upright architecture.

Its symmetry opens up a wide field of play. Children can lay out beautiful mandalas, flower pictures, faces and emotions, animals and figures, and even letters for ABC games. Standing the pieces up creates diverse roof gables, bridges and city walls, so the same set supports both artistic patterns and structural building.

Grimm's lists the Arcs in Squares set for children aged 5 years and up. The number of pieces and the range of design possibilities suit school aged children who enjoy planning and building detailed structures and patterns, though younger siblings often join in with simpler stacking under supervision.

The wooden frame measures about 44.5cm in length, and the single blocks are around 4cm thick. The chunky thickness helps the arches stand steadily when children build upward, and the large frame footprint gives plenty of room to arrange the 81 pieces into wide mandalas or tall constructions.

The blocks are made from lime wood and finished with a non-toxic water based colour stain and a non-toxic plant based oil finish. The combination keeps the natural grain visible while adding colour, and the smooth surfaces are comfortable to handle. As a handmade set, slight variation between pieces is normal.

Yes. Grimm's made it to work well alongside the Building Set Stairway and other large building sets, so you can merge collections for bigger and more elaborate builds. You can browse more compatible pieces in our /collections/grimms-building-rainbow-worlds collection.