Making an Ohel
20. Children commonly drape a blanket over an area to create a playspace, like a little room. This is an issur of making an ohel, as Chazal forbade making an ohel – even without walls – to use the space underneath, even if it will be taken down and will not remain that way for a while (שו''ע סי' שט''ו, ומ''ב סק''כ ).
21. Thus, chinuch-aged children should be cautioned not to do this due to the issur of making an ohel on Shabbos. If they did this, the tent may not be taken down on Shabbos.
Making an Ohel with Construction Toys
22. Similarly, when chinuch-aged children play in a mutar way with toy blocks such as Lego, Clics, Magna-Tiles, Kapla, and the like, they should be cautioned not to build a house-like structure or any other space that has a roof and an internal area of a tefach by a tefach with a tefach height [a tefach is about eight cm], if the space will be used for placing things or toys inside, e.g., to put dolls, toy cars, or the like inside. If they did this, the ohel may not be taken apart on Shabbos (ארחות שבת שם אות י ג'').
