We talk about out of the box thinking being desirable. Why do we constrain ourselves by thinking that there is a box in the first place? Don't give kids a box - unless it is to be used to make something out of like a rocket or something new.
When we teach kids we need to ensure that they have a balance of education where sure - the basic tools are taught, but creativity is one of those tools so there is no taboo about creativity - so that they feel that it is totally normal to imagine what could be
Putting a box around ideas is an old fashioned form of attempted control. Giving kids the creative skills to imagine their ways out of challenges lifts their self esteem and helps them communicate plans and desires to their peers and to adults